use cushy::{
value::{Dynamic, Source},
widget::MakeWidget,
Run,
};
fn main() -> cushy::Result {
let has_unsaved_changes = Dynamic::new(true);
"Prevent Closing"
.into_checkbox(has_unsaved_changes.clone())
.into_window()
.on_close_requested(move |()| !has_unsaved_changes.get())
.run()
}